Also known as: DVSI, Digital Voice Systems

Digital Voice Systems, Inc. (DVSI) is the company that develops and licenses the IMBE and AMBE / AMBE+2 vocoder families based on multi-band excitation.¹

DVSI develops and licenses the patented AMBE and IMBE vocoders.

Overview

DVSI’s codecs are used by P25, DMR, NXDN, and D-STAR. Their patented, licensed nature is why open alternatives like Codec 2 exist.

Relevance to SDR

GopherTrunk implements the relevant vocoders in pure Go to decode digital voice, while respecting the patent/licensing landscape DVSI created.

Sources

1. Multi-Band Excitation — Wikipedia, on DVSI’s IMBE/AMBE multi-band-excitation vocoders and their licensing. ↩

See also

• Vocoder
• IMBE
• AMBE
• AMBE+2
• Multi-band excitation (MBE)

Learn it step by step

• Vocoders — IMBE & AMBE+2